Figure 14. (a) Cross-sectional SEM image of inorganic–organic halide perovskite planar heterojunction flexible solar cell and schematic of flexible
device structure. Scale bar: 200 nm and I–V characteristics measured under the simulated solar light (100 mW/cm 2 AM 1.5G) and (b) normalized
PCE of flexible perovskite devices as a function of bending cycles with different radii of 400, 10, and 4 mm. Inset show the real images taken during
the bending tests.